Just 11 days ago, the Rockies' 23-year-old right-hander dominated the North Siders at Coors Field, striking out seven while recording his first complete-game shutout in a 5-0 win.
"What a good-looking young pitcher," Cubs manager Mike Quade said after Chacin's outing. "To have that kind of repertoire in this kind of ballpark, he was good. We created one, maybe two opportunities. I was impressed."
Chacin will aim to make it 2-0 against Chicago on Wednesday when he faces off against Cubs starter Casey Coleman, as the Rockies try to earn a three-game sweep and complete a second straight winning road trip.
Chacin has shown no signs of a sophomore slump after setting franchise rookie records in 2010 for strikeouts (138) and ERA by a starter (3.28). He is 3-1 with a 2.67 ERA and 18 strikeouts this season.
Coleman, meanwhile, will try to rebound from a rough start his last time out, when he surrendered six runs on six hits over 2 2/3 innings in a 12-2 loss to the Dodgers.
"I didn't do a good job of slowing the game down like a should," he said afterward.
Rockies: Struggling CarGo held out
Mired in an 0-for-21 slump, Carlos Gonzalez was held out of Tuesday's lineup by manager Jim Tracy. Gonzalez, who hit .336 with 34 homers and 117 RBIs in 2010, has battled illness the last two weeks and has had trouble finding a groove against an early string of tough pitching matchups, but he said his confidence hasn't wavered.
"I'm the type of person that likes to battle and work hard to progress," he said. "I know everything will be right eventually."Gonzalez entered Tuesday's 4-3 victory in the eighth inning as a defensive replacement in left. He grounded out in the ninth, extending his skid to 0-for-22.
Todd Helton hit two home runs in Tuesday's win over the Cubs, his first multi-homer game since Aug. 7, 2007, against the Brewers.
Cubs: Baker forcing his way into the lineup
One of Quade's biggest challenges these days is finding space in the lineup for hot-hitting Jeff Baker.
After a 2-for-4 performance on Tuesday, Baker, who can play first, second and third and has been working out in the outfield, is hitting .409 (18-for-44).
"His versatility makes a huge difference," Quade said. "He's swinging the bat so well. It can't be a platoon system for me [at first with Baker and Carlos Pena] because I still would like the left-handed power in the middle of that lineup that I know Carlos has, and I'm not willing to bail on that three weeks into the season in April in Chicago."
With a 16-7 record through 23 games this season, the Rockies have secured just their fifth winning April in franchise history. The start matches the 1997 team for the best record through 23 games in franchise history.
Cubs reliever Jeff Samardzija has thrown nine consecutive scoreless innings dating back to April 12.